How to call a C# library function with ref and out parameter from python?

Question

I use pythonnet not ironpython.

There is a function like this:

test(ref string p1,out string p2)

How can I call test in python 3.6?

import clr
import sys
import System
sys.path.append(r'd:\dll')  
clr.FindAssembly('communication.dll')  
from  communication import *  
dll=IEC62056()
dll.test(----------)

hmm not a best solution but why not make a console program to wrap your dll and then call console program from python ? — Agent_Orange
– Agent_Orange, Commented Mar 7, 2018 at 7:39
@Rahul Agarwal this page is iropython not pythonnet pythonnet.github.io — layty
– layty, Commented Mar 7, 2018 at 8:32
@ Agent_Orange I am sorry, i can't understand, can you show me examples? — layty
– layty, Commented Mar 7, 2018 at 8:35

mdk · Accepted Answer · 2018-05-27 07:34:00Z

1

I can't test the code without communication.dll, so please check if the following code is working for you:

import clr
import sys
sys.path.append("D:\\dll") # path to dll
clr.AddReference("communication") # add reference to communication.dll
from  communication import test

ref_string_p1 = "----------"
out_string_p2 = test(ref_string_p1)
print(out_string_p2)

answered May 27, 2018 at 7:34

mdk

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Comments

willhyper · Accepted Answer · 2020-05-14 04:28:14Z

0

you can feed ref as a regular argument, and feed out arbitrarily. pythonnet will return them positionally as tuple.

assume void test(ref string p1,out string p2) in c#, you get p1, p2 = test(p1, None) in python

answered May 14, 2020 at 4:28

willhyper

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1 Comment

florisla Over a year ago

The documentation about ref parameters is quite clear: pythonnet.github.io/pythonnet/….

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